Q6

[rachael.swetnam]

Hi,
Thanks so much for everything you've posted! I cannot seem to figure out #6. Even the diagram is not helping.

Thanks

[bbirdwell]

It's important here to acknowledge the phrase "complete and accurate." This essentially means, "For which one of these choices can the birds noted be OUT and ALL the other birds be IN?"

Let's take each constraint one by one and eliminate choices.

1. H --> ~G.

This eliminates (E). If H is not in the choice, that means it's IN, and if it's IN, G must be OUT. However, G is not in the choice, either, so that means G is in, which violates the rule.

2. J or M --> H, contrapositive: ~H --> ~J and ~M. Using the contrapositive, if H is in the choice, J and M must also be in the choice. This eliminates (B).

3. W --> G; ~G --> ~W. So if G is in the choice, W must be in the choice. This eliminates (C).

4. ~J --> S; ~S --> J. This essentially means that only one of J or S can be in the choice -- they cannot both be out. This eliminates (A).